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MHT CET202616 April 2026Evening ShiftChemistryd and f Block ElementsActual

What is the oxidation state of chromium in the final product when KI reacts with acidified potassium dichromate solution?

Options

  1. A+2
  2. B+3
  3. C+6
  4. D+4

Correct answer

B. +3

Step-by-step solution

Potassium dichromate ( K₂Cr₂O₇ ) acts as a strong oxidizing agent in an acidic medium. It oxidizes iodide ions ( I^- ) from KI to iodine ( I₂ ) and itself gets reduced to chromium(III) ions ( Cr³⁺ ). The ionic equation for the reaction is: Cr₂O₇²⁻ + 14H^+ + 6I^- 2Cr³⁺ + 3I₂ + 7H₂O In the final product, chromium is present as Cr³⁺ . Therefore, the oxidation state of chromium in the final product is +3 . Answer: +3

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